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<title>buffer_sequence_begin</title>
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.buffer_sequence_begin"></a><a class="link" href="buffer_sequence_begin.html" title="buffer_sequence_begin">buffer_sequence_begin</a>
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</h3></div></div></div>
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<p>
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<a class="indexterm" name="asio.indexterm.buffer_sequence_begin"></a>
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</p>
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<p>
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The <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer_sequence_begin</span></code> function returns
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an iterator pointing to the first element in a buffer sequence.
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</p>
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<p>
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Get an iterator to the first element in a buffer sequence.
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</p>
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<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">MutableBuffer</span><span class="special">></span>
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<span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">*</span> <a class="link" href="buffer_sequence_begin/overload1.html" title="buffer_sequence_begin (1 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">MutableBuffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">MutableBuffer</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload1.html" title="buffer_sequence_begin (1 of 6 overloads)">more...</a></em></span>
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">ConstBuffer</span><span class="special">></span>
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<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">*</span> <a class="link" href="buffer_sequence_begin/overload2.html" title="buffer_sequence_begin (2 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">ConstBuffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">ConstBuffer</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload2.html" title="buffer_sequence_begin (2 of 6 overloads)">more...</a></em></span>
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">C</span><span class="special">></span>
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<span class="keyword">auto</span> <a class="link" href="buffer_sequence_begin/overload3.html" title="buffer_sequence_begin (3 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="identifier">C</span> <span class="special">&</span> <span class="identifier">c</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="special">!</span><span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">C</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">&&!</span><span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">C</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload3.html" title="buffer_sequence_begin (3 of 6 overloads)">more...</a></em></span>
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<span class="keyword">template</span><span class="special"><</span>
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<span class="keyword">typename</span> <span class="identifier">C</span><span class="special">></span>
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<span class="keyword">auto</span> <a class="link" href="buffer_sequence_begin/overload4.html" title="buffer_sequence_begin (4 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">C</span> <span class="special">&</span> <span class="identifier">c</span><span class="special">,</span>
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<span class="keyword">typename</span> <span class="identifier">constraint</span><span class="special"><</span> <span class="special">!</span><span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">C</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">&&!</span><span class="identifier">is_convertible</span><span class="special"><</span> <span class="keyword">const</span> <span class="identifier">C</span> <span class="special">*,</span> <span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">*</span> <span class="special">>::</span><span class="identifier">value</span> <span class="special">>::</span><span class="identifier">type</span> <span class="special">=</span> <span class="number">0</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload4.html" title="buffer_sequence_begin (4 of 6 overloads)">more...</a></em></span>
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</pre>
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<p>
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Get an iterator to the first element in a buffer sequence.
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</p>
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<pre class="programlisting"><span class="keyword">const</span> <span class="identifier">mutable_buffer</span> <span class="special">*</span> <a class="link" href="buffer_sequence_begin/overload5.html" title="buffer_sequence_begin (5 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">mutable_registered_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload5.html" title="buffer_sequence_begin (5 of 6 overloads)">more...</a></em></span>
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<span class="keyword">const</span> <span class="identifier">const_buffer</span> <span class="special">*</span> <a class="link" href="buffer_sequence_begin/overload6.html" title="buffer_sequence_begin (6 of 6 overloads)">buffer_sequence_begin</a><span class="special">(</span>
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<span class="keyword">const</span> <span class="identifier">const_registered_buffer</span> <span class="special">&</span> <span class="identifier">b</span><span class="special">);</span>
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<span class="emphasis"><em>» <a class="link" href="buffer_sequence_begin/overload6.html" title="buffer_sequence_begin (6 of 6 overloads)">more...</a></em></span>
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</pre>
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<h5>
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<a name="asio.reference.buffer_sequence_begin.h0"></a>
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<span><a name="asio.reference.buffer_sequence_begin.requirements"></a></span><a class="link" href="buffer_sequence_begin.html#asio.reference.buffer_sequence_begin.requirements">Requirements</a>
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</h5>
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<p>
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<span class="emphasis"><em>Header: </em></span><code class="literal">asio/buffer.hpp</code>
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</p>
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<p>
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<span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
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</p>
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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</p>
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